Motor fan



April 8, 1958 MASAHIKO OBA MOTOR FAN Filed March 6, 1956 5 Sheets-Sheet1 INVENTOR.

ATTORNEY;

April 8, 1958 MASAHIKQ OBA MOTOR FAN 5 Sheets-Sheet 2 Filed March 6,1956 IN VEN TOR.

A TTORNEY.

MASAHIKO OBA MOTOR FAN April s, 1958 Filed March e, 1956 3 Sheets-Sheet3 I N VEN TOR.

A TTORNEY.

United States Patent-O 1 2,829,525 MOTOR FAN Masahiko Oba, Hofu-shi,Yamaguchi-ken, Japan Application March 6, 1956, Serial No. 569,796Claims priority, application Japan March 11, 1955 1 Claim. (Cl. 74---25)This invention relates to a motor fan which is so made as to performboth oscillating fan-draft blowing and allround revolving fan-draftblowing, by utilizing the oscillation mechanism of an ordinary motorfan.

Motor fans heretofore in use can not perform all-round revolvingfan-draft blowing.

Therefore, an important feature and object of the present invention isto provide motor fans of new type which can perform both oscillatingfan-draft blowing and continuous all-round revolving fan-draft blowing,with relatively simple construct-ion and by utilizing the oscillationmechanism of an ordinary motor fan.

Another object of the present invention is to provide motor fans of newtype of which blowing manner can readily be exchanged, with very simplehand adjustment of a part of the mechanism, into oscillating fan-draftblowing from all-round revolving fan-draft blowing or vice versa.

The novel features which I believe to be characteristic of my inventionare set forth with particularity in the appended claim. My inventionitself, however, both as to its construction and function together withfurther objects and advantages thereof, may best be understood byreference to the following description, taken in connection with theaccompanying drawings, in which:

Figure l is a diagrammatic side view of an example of the presentinvention.

Figure 2 is an enlarged side view of the main part of oscillating andrevolving mechanism of the example in Figure 1, sectioned vertically.

Figure 3 is a diagrammatic view for describing the function of theexample in Figures 1 and 2.

Figure 4 is a vertically sectioned side view of the main mechanism ofanother example of the present invention.

Figure 5 is plan and side views of the exchange wheel used for theexample in Figure 4.

Referring to Figures 1 and 2, a fan motor 4 equipped with an oscillationdevice 14 of an ordinary type is fixedly mounted atop the vertical shaft2 which is so installed in the fan stand 1 as to rotate itself smoothly.For said installation, said shaft 2 is provided with a downwardlyextending shaft 2a which is screwed in the shaft 2, said shaft 2a beingsupported by the fan stand 1 through a bearing 15 and said shaft 2 beingrotatively fitted in a sleeve 3 which in turn is steadfastly fixed tothe fan stand 1 by a suitable manner, for example by a knock pin 17which reaches a vertical slot 21 of the sleeve 3.

An upper moving wheel 5 provided with a circular groove and a lowermoving wheel 6 provided with a projected arm 16 are installed on outerside of the sleeve 3. The upper moving wheel 5 is connected to the crankwheel 7 of the oscillation device 14 at their circular grooves by meansof an elastic belt 8 and the arm 16 of the lower moving wheel 6 ispivoted to the eccentric pin 10 of the crank wheel 7 by means of aconnecting rod 9. Screw bolts 11 and 12 are screwed in to reach thesleeve 3 from the outside of the moving wheels 5 and 6, respectively.Electric current to the fan motor 4 is circuited by way of slip rings 18which are attached on outer side of the shaft 2a so that current feedingmay be possible even when the vertical shaft 2 is in rotation, each ofsaid slip rings being in contact with respective carbon brush 19 whichin turn is supported by a brush holder 20.

2 ,829,525 Patented Apr. 8, 1958 In the above example, when theoscillating fan-draft blowing is required, the screw bolt 11 of theupper moving wheel 5 is loosened to leave the wheel 5 in a state of aloose wheel and to make it run idle around the sleeve 3, and the screwbolt 12 of the lower moving wheel 6 is tightened to fix the wheel 6firmly to the sleeve 3.

Now, if the push button 13 of the oscillation device is pushed down tolet the crank wheel 7 rotate, the crank wheel 7 will, by combined workwith the eccentric crank pin 10 and connecting rod 9, drive the fanmotor 4 to perform oscillation by taking the vertical shaft 2 as itsaxis of oscillation. When all-round revolving fan-draft blowing isdesired, the screw bolt 12 of the lower moving wheel 6 is loosened toleave the wheel 6 in a state of a loose wheel, and the screw bolt 11 ofthe upper moving wheel 5 is tightened to fix the wheel 5 firmly to thesleeve 3. Now, if the push button 13 is pushed down to let the crankwheel 7 rotate, the fan motor 4 will start, by inter-relative work ofthe crank wheel 7, elastic belt 8 and the stationalized upper movingwheel 5, to perform a continuous revolution by taking the vertical shaft2 as its axis of revolution, function of said performance of themechanism being explained as follows, in

connection with Figure 3.

Referring to Figure 3, the character A indicates the upper moving wheel5 in an immovable state being tightly fixed to the sleeve 3 by the screwbolt 11. The character B indicates a state of the crank wheel 7performing self-rotation in the direction indicated by the curvedfull-line arrow. The character C indicates the elastic belt 8 spanningbetween the crank wheel 7 and the upper moving wheel 5 and moving in thedirection indicated by rectilinear arrows. When the wheels 5 and 7 andthe belt 8 are in the state shown in Figure 3, the crank wheel 7 isrotating in the direction of the curved fullline arrow and is trying torotate the upper moving wheel 5 by driving the elastic belt 8 towardsthe direction indicated by the rectilinear arrows.

However, since the upper moving wheel 5 is tightly fixed to the sleeve3, it does not move. Consequently, the motive power transmitted from thecrank wheel 7 to the elastic belt 8 will automatically work to revolvethe crank wheel 7 itself towards the direction contrary to the crankwheels own rotation, that is, towards the dotted arrow.

This movement of changing position of the crank wheel 7 continues aslong as said wheel continues to rotate itself, so that position of thecrank wheel 7 moves around the upper moving wheel 5 in the directionindicated by the dotted arrow, orbit of said movement being a circlehaving a radius which is equal to the distance between the centers ofboth wheels 5 and 7. In other words, the crank wheel 7 revolves aroundthe upper moving wheel 5 by taking the distance between the centers ofboth wheels 5 and 7 as its radius of circular revolution while itrotates itself in the direction indicated by the curved full-line arrow.

Since the crank wheel 7 is so made as to work jointly with the fan motor4 in unison, the revolution ofsaid wheel 7 drives the fan to turn roundby taking the vertical shaft 2 as its axis of rotation, and thus, thisinvented mechanism works to let the fan perform a continuous allroundrevolution. 7

According to the present invention, the following advantages will beobtained, as will clearly be presumed from the above description.

(a) Since the fan can perform a continuous revolution while it isoperating draft blowing, itcan send out wind to all the directionsaround.

([2) Since the fan continuously works to let the atmosphere flow in thesame direction of the revolution of the 7 hole 33;

fan, it provided constant breeze in the room where it is installed.

Of course, if desired, it can so easily be set as to perform usualoscillating fan-draft blowing.

In embodying the present invention, for the purpose of fixing one of theupper and lower moving wheels and loosening another, any suitablemechanism other than the screw bolts iii and 12 illustrated in Figuresl3 may be used, for example, the mechanism shown in Figures 4 and may beused.

In Figures 4 and 5, the same parts as those in the example in Figures1-3 are denoted by same numerals.

Referring to Figures 4 and 5, the vertical shaft 2 supporting fan motoron its top is so installed in the fan stand 1 as to rotate itselfsmoothly. For said installation, said shaft 2 is provided with adownwardly extending shaft 2a which is screwed in the shaft 2, saidshaft 2a being supported by the stand 1 through a bearing and said shaft2 being rotatively fitted in the sleeve 3 which is provided with avertical slot 21 and fixed to the fan stand 1 by means of a knock pin1"] which reaches said slot 21. An exchange wheel 22 is mounted atop thefan stand 1, and the lower moving wheel 6 provided with a projected arm16, a guide ring 32 and the upper moving wheel 5 are'mounted above theexchange wheel 22. Between the sleeve 3 and lower moving wheel 6 isinserted a litter 2t? slidably in the vertical direction, said lifterbeing provided with a circular flange 3%), a vertical slot 28 and anouter screw thread 2'7 which is so made as to fit the screw thread ofthe exchange wheel 22. A knock pin 22 projecting upwards from the lifter26 is so made as to be thrusted into the guide hole 33 perforated in theguide ring 32. The vertical slot 28 of the lifter 26 is so slotted as tolit the knock pin 31 installed in the outer side of the sleeve 3 andprevents rotation of the lifter 26.

Several hollows 34 are hollowed out on the under facet of the uppermoving wheel 5 to match with the guide Said wheel 5 is connected to thecrank wheel such as shown by the wheel. '7 in Figure l, by an elasticbelt 8 spanning between them. The crank pin of said crank wheel isconnected to the lower moving wheel 6 by means of a connecting rod suchas shown by the rod 9 in Figure 1. Electric current to the fan motor iscircuited by way of such slip rings and contact brushes as described andshown in connection with the example in Figures l-3, said members beingomitted in Figure 4.

In the fan motor provided with the mechanism illustrated in Figures 4and 5, for changing the fan-draft blowing from oscillation to revolution(or Vice versa), firstly it is necessary to turn the exchange wheel 22until the pin 23 attached downwardly to said w eel 22 engages with a pin24 set in the fan stand 1.. Then, the lifter 26 will be screwed downwith said turning of the exchange wheel 22 and will press the lowermoving wheel 6 downwards with its flange 30, and at the same time, theknock pin 29 of the lifter 26 will slip down out of the hollow 34.thereby the upper moving wheel 5 is left in a free state. if theelectric circuit is switched on under the above state, the fan motormounted on the vertical shaft 2 revolves. In this case, the lower movingwheel 6, which is so connected to the crank wheel of the oscillationdevice by a connecting rod, as shown in Figure 1, is fixed immovable, sothat said connecting rod will be operated as in the case of an ordinaryoscillating motor fan and the fan will perform oscillatory draftblowing.

Although the revolving motion is transmitted to the upper moving wheel 5by the elastic belt 8 in this case, said wheel 5 will merely run idlearound the sleeve 3 because of free state thereof. Now, if the exchangewheel 22 is turned in reverse way until the pin 23 of said wheel 22engages with other pin which is set in the fan stand 1, the lifter 2-6will be driven upward by the screw thread 27 releasing the pressureexecuted on the lower moving wheel 6, thereby said Wheel 6 is set in afree state. On the other hand, at the same time with said upward motionof the lifter 26 the knock pin 29 will insert into the hollow 34 of theupper moving wheel 5 and will stop the rotating motion of said wheel 5.At this condition, the crank wheel of the oscillation device such asshown by numeral 14 in Figure 1 Will revolve around the vertical shaft 2by taking the shaft 2 as its axis of revolution, in the same manner asdescribed minutely in connection will Figure 3.

Since said crank wheel and the fan motor are made to work in unison, thefan rotates itself round horizontally at the some time with its windblowing operation as in the case of the illustration in Figures 1-3.Thus, either the oscillating fan-draft blowing or the revolvingfan-draft blowing is rapidly available as desired by turning theexchange wheel 22 only clockwise or counterclockwise.

According to the mechanism in Figures 4 and 5, another advantage besidesabove operations will be obtained.

That is, when a change of oscillating direction is desired, saidoperation can readily be attained by loosening the exchange wheel 22,turning the lower moving Wheel 6 and then tightening said wheel 22,successively.

While I have described in connection with particular embodiments of thepresent invention, it will, of course, be understood that I do not wishto be limited thereto, since many modifications may be made and Itherefore, contemplate by the appended claim to cover all suchmodifications as fall within the true spirit and scope of my invention.I

I claim as my invention:

A motor fan with a specific character to be able to perform both theoscillation and the all-round revolution, which comprises a fan motormounted atop a vertical shaft which is so installed in the fan stand asto rotate itself smoothly, an oscillating device mounted on said motorand having a vertical shaft driven by the motor and a circumferentiallygrooved crank wheel fixed on said shaft, a sleeve surrounding saidfirst-mentioned vertical shaft, an exchange wheel, a lower moving wheeland an upper moving wheel which are so mounted around said sleeve as tobe rotated around said sleeve, said upper moving wheel beingcircumferentially grooved and being connected to the crank wheel of saidoscillation device by an elastic belt and said lower moving wheel beingconnected to an eccentric crank pin of said crank wheel by a connectingrod, a lifter installed between said second moving wheel and said sleeveand fitted with said exchange wheel by means of screw thread so as to bemoved up or down by turning said exchange wheel either clockwise orcounterclockwise, a knock pin on said lifter, and several hollows whichare hollowed out on the under facet of said upper moving wheel so as tolet said knock pin fit therein when said lifter is lifted, said membersbeing so formed and combined that when said lifter is screwed down byturning the exchange wheel by hand, the lifted itself may work as astop-brake for holding the lower moving wheel in selected position andat the same time may leave the upper moving wheel in a free rotativestate and thereby allow the fan to perform the oscillating operation,and when the lifter is screwed upward, the lower moving wheel may bereleased from the braking pressure and may become a loose wheel, and atthe same time, the knock pin of the lifter may be inserted into a hollowof the upper moving wheel and work as a stop-brake for the upper movingwheel, and thereby allow the fan to perform the revolving operation.

References Cited in the file of this patent UNlTED STATES PATENTS1,373,480 Brainerd Apr. 5, 1921 1,597,752 Aalborg Aug. 31, 19261,659,501 Smith Jr. Feb. 14, 1928 1,879,150 Ferguson Sept. 27, 1932

